3957720 has 128 divisors (see below), whose sum is σ = 13305600. Its totient is φ = 935424.

The previous prime is 3957713. The next prime is 3957743. The reversal of 3957720 is 277593.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67051 + ... + 67109.

It is an arithmetic number, because the mean of its divisors is an integer number (103950).

Almost surely, 2^3957720 is an apocalyptic number.

3957720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3957720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6652800).

3957720 is an abundant number, since it is smaller than the sum of its proper divisors (9347880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3957720 is a wasteful number, since it uses less digits than its factorization.

3957720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 13230, while the sum is 33.

The square root of 3957720 is about 1989.4019201760. The cubic root of 3957720 is about 158.1788286587.

The spelling of 3957720 in words is "three million, nine hundred fifty-seven thousand, seven hundred twenty".